Tool drive



Feb. 26, .1946.

E. c. SCOTT,

TOOL DRIVE Filed Oct. 7, 1942 2 Sheets-Sheet l INVENTOR 5.0.sg077 BY I'll-ll..-

FIG I A 7' TORNEY Feb. 26, 1946. S OTT 2,395,586

, TOOL DRIVE Filed Oct. 7, 1942 2 Sheets-Sheet 2 INVENTOR 5.6. scorr I r BY .gRm QM ATTORNEY Patented Feb. 26, 1946 f a 2,395,58 TOOL DRIVE Edward C. Scott, Cranford, N. J assignor to Western Electric Company, Incorporated, New York, N. 2., a corporation of New York Application October 7, 1942, Serial No. 461,185

2 Claims. (Cl. 8224) This invention relates to tool drives, and more particularly to tool drives for hand-operated screw machines.

tion of such machines.

An object of the invention is to provide an efiicient and highly practical combined manual and power driven tool holder for use in material working machines.

With this and other objects in view, the invention comprises a tool drive for a material working machine including a tool holder, the latter being adapted for movement in either direction relative to the work through manual control -means, power means also being adapted at selected intervals to move the tool holder relative to the work.

Other objects and advantages will be apparent from the following detailed description when considered in conjunction with the accompanying drawings, wherein Fig. 1 is a fragmentary top plan view of a material working machine embodying the invention, portions thereof being shown in section;

Fig. 2 is a front elevational view of the structure shown in Fig. 1;

Fig. 3 is a fragmentary side elevational view of the structure shown in Fig. 1;- and Fig. 4 is an enlarged fragmentary sectional view taken along the line 44 of Fig. 3.

' Referring now to the drawings, the machine indicated at 10, and selected to illustrate the invention, is of the hand-controlled screw machine type having a bed ll upon which a head [2 is mounted. The head I2 is of the conventional type, having a rotatable chuck [4 for supporting work [5. A base I6 for a tool supporting unit I! is mounted upon the bed II by suitable means, such as a fixed lug l8 and a clamp IS. The base It is provided with a dovetail central portion 20 which extends the full length thereof for movement of the carriage transversely of the bed II on the base it. Longitudinal parallel grooves 24 (Fig. 3) in the upper surface of the carriage provide means, through the aid of bolts 25, for the mounting of a tool 26 in a selected position' on the carriage. The structure of the tool is in the present instance immaterial, it being understood, however, that the tool is to be moved into the work l5 during rotation of the chuck M.

A threaded shaft 23, having a smooth portion rotatable in a retaining collar 29 to maintain the shaft against longitudinal movement with respect to the carriage, projects inwardly through a nut 38. The nut 3B is threaded to provide a positive, yet sufficiently loose, connection with the threaded shaft and is pivotally supported, at 3|, upon an arm 32 integral with the base It. The threaded shaft has an enlarged ortion 34 beginning at a front face 35 (Fig. 3) of the carriage 2| and extending through a spacing collar 36 in a sleeve bearing 37. An outermost portion 38 of the threaded shaft 28 is reduced as shown in Fig. 4

- and projects into a sleeve 39, to which it is fixed for interengagement with a carriage 2| through tends substantially the full length of the carriage by the aid of a pin 40. A crank 44 is fixedly mounted upon the sleeve 39, as indicated at 45, thus providing manually operable means for actuating the carriage by rotating the threaded shaft 28.

Power driven means is also provided to drive the carriage. This means includes a sprocket 47 mounted upon the bearing 31 for free rotation on the shaft, that is the portion 34 thereof. The sprocket 4'! is held against axial movement relatitre to the shaft in one direction by the collar 36, and in the other by a fiange portion 48 of the sleeve 39. A clutch member 50 is secured or formed integral with the sprocket 41, providing a series of teeth 5! for interengagement with teeth 52 of another clutch member 53. The clutch member 53 is keyed to the sleeve 39, as at 55, for continuous rotation with the shaft 28 through the rotation of the sleeve and is movable into two positions, namely a normal or inoperative position and an operative position. These'positions are controlled by a spring pressed plunger 56 receivable in recesses 51 and 58 in the sleeve 39. At the present instance the plunger 56 is in the inoperative or normal position in registration with recess 51. When moved into registration with the recess 58, the plunger and the clutch member 53 will be in their operative positions. This movement is brought about through the aid of a button or actuable element 60 which has a shank portion 6| movably disposed in the sleeve 39 and provided with a pin 62 which ex:-

tends through the shank and through diametrically opposed elongate apertures 63 in the sleeve and into the clutch member 53. Thus, by axial movement of the button or element 50, the clutch member 53 may be moved into and out of engagement with the clutch member 50.

The sprocket 41, during operation of the machine, isscontinuouslyidriven hyla power means such asra motor 565. In the present-instance the member 53 is also located in either position, removing the possibility of any accidental connection or disconnection of the clutch members.

Although specific improvements of the invention have been shown and described, it will be understood that they are but illustrative and that various modifications may be made therein withnutdeparting irom thescopeland spirit of this invention as ide'fin d by-the appended cla ms.

motor is of the electrically operable type having 10 What is claimed is:

a speed reducing unit 66 which, through a chain 1. A tool drive attachment for a machine hav- 69, drives the sprocket 41. The motor unit is i a b and a upp for wo e too ve mounted upon a bracket 10 which is adjustabl attachment comprising a base formed for mountsecured to the carriage by the: aid of screws ll, in 7 the bed relative the W a rri the latter being adjustably receivable Lin-. 'i'rmounted for movement on the base toward and shaped slot I2 of a flange l3 mounted upomthe side wall of the carriage. A switch unit 15, mounted upon the motor -65, includes '-a start switch 16 and a stop switch 11, the former switch being manually actuable while the latter is op- -'-rated by an adjustable stop screw -78. The stop "sci efv'v is mounted at a-suitable position, for-example'on a bracket 'Wsupportedfbythe head 12. Gon'sitlering now the control or operation of the machineglet it'be assumed that the-chuck I4 is *iiriven to rotate the' work [5 in a suitable direction arid that the seleeted tool 2li is mounted upon th'e'j carriage fl at "a --desired "position. At this time' the operator may select either the manual br p'owerdriven meanstomove the carriage, or ne mayj if lie-so desires, use both. As-illustrated, th e -*clutch members 50 and 53 are i in their open or inoperative po'sitions. "When in this :position tl'ieoperatcr may move the carriage =by rotating the crank N. L-ietit -'=be-=assumed, however,- that 1 thepower driven meansis to be utilized. The-re- -fore, by pressing' the button 60 inwardly, or to the' right '(Fig. i) the clutch member 53 may be moved into closedposition in interengagement with the clutch member 50. The-switch 'lli may then *be "actuated, causing 'energization 0f the "motorandrota-ry movement of the sprocket-'41, tlre -latte'r driving the shaft-2'8; through the clutch members 50 arid53, the'sleeve 39 and the pm 4 0. "The rotation ot the threaded shaft rela- "tive to the 1 nut will "cause imvard movement o? the carriage to move -the' tool toward and into engagement with the work. When the tool 'has -c6inpleted' its 'cut,"the stop switch will beaotw *ated "-by the screw 18' to kieenergize the motor. f'he power means may then A be disconnected by pulling the "button- 68 outwardly, at which -time the carriage may lee-returned 'to its starting po'sit-ion through the a manual -actuation of thecrank Iliis 'return movement of the carriage re- 'quires little eifort on th-e part -of the operator. it is the movement of i the carriage to 1 move the to'ol during the cutting operation that 3 requires +considerableeifort. "Th-isportion of the operation, however, through the power "operating meansira *quires of *the operator 'onl'y the 'aetuation of =the 'butto'n 60'andthe*switch' lfi. Furthermorefiwith the "mower drive the tool is 1 moved 1 uniformly. ItytiIl 'beapi'narer'it --that-through the aid of the *lplunger fi and its recesses 5 1 *a n'd 5B,' the clutoh away 'r'rom'the work, means for mounting a tool on the carriage, a motor mounted on the carriage and movable therewith, athreaded shaft rotatably supported by the carriage and longitudinally movable therewith, a threaded member :throughiwhich the threadedshaft extends mountz'ed LIIDOD. the base, an i element mounted..for @free rotation on the threaded shaft, ameans operatively;connecting the motor to :the element to 25 scauseirotation of theelementnpon .energization of the imotor, a :manually .actuable memberzfixiedly :mounted'upon the outer end ofwthe threaded shaft :for rotating the shaft to move the :car- -;ria-ge with the :tool toward and away from ;-the L-wDik, ,and a :clutch imember' keyed to the :man- -ual1y "actuable member and movable axially e-thereonizto thereby ,operatively connect the eletmentito the threadedlshaft whereby power'sup- -plied:by the motorrotates-the shaft.

2. A tool drive attachment fora-machine hav- :ing;a;bed;and a support for-work, thetool drive attachment; comprisingrabase formed ,for mountling on :rthe :bed 1 relative 'to the :wQrk, ;a carriage mounted for movement on thezbaseitoward and away :from ;the work, means for mounting a --tool {on ithe :carriage, a motor :mounted on :the rcarriagexand movable, therewith,.- aithreaded shaft irotatablyrsupported byxzthe carriage and longi- Ztudinallymovabletherewith, a threaded member 5 throughwhich thethreaded shaft extends mount- :ed npon ;the base, an telementsmountedgfor (free rotation on the threaded shaft, means :Dpera- --tively connectingwtheimotor'to the 1 element to i'causeirotation r .Of'ithfl element ill-p011! ener lzatlon oiithemotorsa manually-actuable: memberfixedly mounted upon the outer end ofstthe threaded-shaft for: rotating zthe shaft to movezthezcarriage ,with --the'-:;tool toward and away sfrom ithe -=wor.k. ma clutch member .wkeyed :toi the imanuall-y :actuable memberaand 'movablez axiaily thereon :to ithereby operatively connect the element toithezthreaded :shiaft :wherebyzpowerxsupplied, by the imotomrotates the shaft; .meahsztorlatoh the :clutchzmem then in 'operativeandainoperative engagement with the elementganri vmeanscarried ;by' thergmanuaily tactuable member; amiaactuable to'moveitheiclutch imemberfiinrioperative rand zinoperative cen a ment-rwith thezelement.

EEDWARDiCQ-SGQIET. 

